RTC hold capacitor

[KanyeKanye]

I would use WROOM module, so VDD3P3_RTC is not available.
How can I hold RTC when main power is down and do not drain its energy too fast - how to programmatically switch off everything but RTC, what current is needed than?

[WiFive]

http://esp-idf.readthedocs.io/en/latest ... sleep.html

5-10uA